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GB/T 18685-2017: The blank diameters for rolling general purpose metric screw threads
Status: Valid GB/T 18685: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 18685-2017 | English | 179 |
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The blank diameters for rolling general purpose metric screw threads
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GB/T 18685-2017
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| GB/T 18685-2002 | English | 85 |
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The bar diameters for rolling general purpose metric screw threads
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GB/T 18685-2002
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PDF similar to GB/T 18685-2017
Basic data | Standard ID | GB/T 18685-2017 (GB/T18685-2017) | | Description (Translated English) | The blank diameters for rolling general purpose metric screw threads | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J04 | | Classification of International Standard | 21.040.01 | | Word Count Estimation | 9,992 | | Date of Issue | 2017-09-29 | | Date of Implementation | 2018-04-01 | | Older Standard (superseded by this standard) | GB/T 18685-2002 | | Regulation (derived from) | National Standard Announcement 2017 No. 23 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GB/T 18685-2017: The blank diameters for rolling general purpose metric screw threads---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
The blank diameters for rolling general purpose metric screw threads
ICS 21.040.01
J04
National Standards of People's Republic of China
Replacing GB/T 18685-2002
Ordinary thread rubbing and roughing rough diameter
2017-09-29 Posted
2018-04-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 18685-2002 "rub, roll rough diameter before the ordinary thread." Compared with GB/T 18685-2002,
In addition to editorial changes, the main technical changes are as follows.
--- This standard adds 22 threads specifications (M8 × 0.75, M10 × 0.75, M18 × 1, M20 × 1, M22 × 1, M24 × 1,
M27 × 1, M30 × 1, M39 × 4, M42 × 4, M45 × 4, M45 × 3, M45 × 2, M45 × 1.5, M48 × 4, M48 × 3,
M48 × 2, M48 × 1.5, M52 × 4, M52 × 3, M52 × 2, M52 × 1.5) (see Table 1);
--- Turning process using rough, the standard with "surface roughness profile arithmetic average deviation of the value of 2 times (2Ra)" amendment Mao
Blank diameter;.2002 edition of the standard "surface roughness profile maximum height value (Rz)" to amend the blank diameter (see 7.1,.2002 edition
Chapter 7, paragraph 1);
--- The standard recommended rough diameter and thread diameter tolerance ratio of not less than 0.20, do not meet the conditions of 11 specifications of the 4
The maximum diameter of the thread blank has been adjusted (the calculation does not take into account the diameter of the ring end of the thread shrinkage factor fT) (M18 × 2.5,
M20 × 2.5, M22 × 2.5, M30 × 3.5, M33 × 3.5, M36 × 4, M39 × 4, M42 × 4, M45 × 4, M48 × 4,
M52 × 4);.2002 version of the standard diameter of the rough conditions given is not less than 0.01mm, it does not adjust the rough
Maximum diameter (see Chapter 7 and Tables A.2 and A.22, Table 1);
--- This standard to determine thread through ring thread length (B) method and the.2002 version of the standard (see A.1,.2002 version A.1).
This standard by the National Standardization Technical Committee threaded (SAC/TC108) and focal point.
This standard was drafted unit. Shaoxing Mountain High Pressure Fasteners Co., Ltd., machine Productivity Promotion Center, CATIC First Aircraft Research Institute, China
Aeronautical Integrated Technology Institute.
The main drafters of this standard. Song Weidong, Li Xiaobin, Zhao Huiting, Xu Ling, Lingyun Xia.
This standard superseded standard previous versions of the situation.
--- GB/T 18685-2002.
Ordinary thread rubbing and roughing rough diameter
1 Scope
This standard specifies the general thread rubbing and rolling before the blank diameter size. Common thread nominal diameter range of 1mm ~ 52mm
(First and second series of diameter; maximum pitch 4mm); thread tolerance with 4h, 6h, 6g, 6f and 6e five.
This standard applies to the all-dental extrusion process of carbon steel and alloy steel ordinary thread.
Note. "Tooth-type extrusion process" refers to the thread extrusion process, the thread material is fully filled with the cutter tooth bottom space processing methods.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 971-2008 thread rolling wheel
GB/T 972-2008 Roll plate
GB/T 3934-2003 General thread gauge technical conditions
GB/T 14791 thread terminology
3 Terms and definitions
GB/T 14791 defined terms and definitions apply to this document.
4 blank diameter formula
The formulas for calculating the diameter of rubbing and rolling thread blanks shall comply with the provisions of Appendix A.
5 rough diameter diameter size
Ordinary thread rubbing and rolling before the rough diameter diameter size should be consistent with the provisions of Table 1.
6 thread tool accuracy grade
Roll or rolling wheel accuracy level should be specified in Table 2 thread tolerance level and tool accuracy level corresponding to choose.
Ordinary thread rolling plate and rolling wheel size should be consistent with the provisions of GB/T 972-2008 and GB/T 971-2008.
7 rough diameter adjustment
7.1 Recommended drawing or grinding process rough diameter. When using turning technology processing rough, the blank diameter should be specified in Table 1
Based on the arithmetic average deviation of its surface roughness profile double (2Ra).
7.2 Non-full tooth extrusion process thread, the minimum diameter of the blank can be used in Table 1 provides a smaller value.
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